4.Noun. A large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States.

Definition of Submarine

1.a. Being, acting, or growing, under water in the sea; as, submarine navigators; submarine plants.

2.n. A submarine plant or animal.

3.n. A submarine boat; esp., Nav., a submarine torpedo boat; -- called specif. submergible submarine when capable of operating at various depths and of traveling considerable distances under water, and submersible submarine when capable of being only partly submerged, i.e., so that the conning tower, etc., is still above water. The latter type and most of the former type are submerged as desired by regulating the amount of water admitted to the ballast tanks and sink on an even keel; some of the former type effect submersion while under way by means of horizontal rudders, in some cases also with admission of water to the ballast tanks.

3.The New York Times Current History (1917)"May К—Danish steamer Cathay is sunk by a German submarine In the North Sea ...
May 12—British submarine E-14 has penetrated to the Sea of Marmora and has ..."

5.The Engineering Index Annual for by American Society of Mechanical Engineers (1915)"Describes the spying tube of the submarine and its development. Ills. 1200 w.
Sci Am—Jan. ... 56974 A. The Submarine. Extracts from a lecture by Prof. ..."